Which solution is more concentrated?
2.7 L of solution containing 3.0 mol HCl or 120 ml of solution made by dissolving 3.0x10^22 molecules of HCl
The working out is necessary, I am unsure of how to work it out, I already have the answer though. Thanks
I think the question should be modified in the end part. It should not be 3.0x10^22 molecules. It should be 3.0x10^22 particles of HCl.
Otherwise You will have a HCl concentration which you will never achieve in the sample.
HCl is completely dissolve in water. So we get `H^+` moles equal to the HCl moles we pu in water.
For the first one we have 3 mol of HCl in 2.7 liters of water.
Concentration is defined as the amount of moles in 1 liter of water.
So its `H^+` concentration = 3/2.7 mol/l
For the second one 3.0x10^22 particles HCl dissolved in 120ml of water.
In Avagadro law he has indicated that a mole of a substance has 6.022xx 10^-23 particles.
So number of moles in second solution =3.0x10^22 /6.022xx 10^-23
So the H^+concentration in second solution = 0.05/120*1000 mol/l
= 0.4167 mol/l
So First one has more H^+ concentration.